U.S. patent application number 14/014574 was filed with the patent office on 2014-04-24 for dual band antenna and wireless communication device employing same.
This patent application is currently assigned to CHIUN MAI COMMUNICATION SYSTEMS, INC.. The applicant listed for this patent is CHIUN MAI COMMUNICATION SYSTEMS, INC.. Invention is credited to YI-CHIEH LEE, YEN-HUI LIN.
Application Number | 20140111382 14/014574 |
Document ID | / |
Family ID | 50484869 |
Filed Date | 2014-04-24 |
United States Patent
Application |
20140111382 |
Kind Code |
A1 |
LEE; YI-CHIEH ; et
al. |
April 24, 2014 |
DUAL BAND ANTENNA AND WIRELESS COMMUNICATION DEVICE EMPLOYING
SAME
Abstract
A dual band antenna includes a first radiating portion, a second
radiating portion, and a resonating portion. The first radiating
portion includes a first feeding arm that feeds first signals at a
first frequency band. The second radiating portion is positioned
spaced apart from the first radiating portion. The second radiating
portion includes a second feeding arm that feeds second signals at
a second frequency band. The resonating portion is connected
between the first radiating portion and the second radiating
portion. The resonating portion resonates with the first and second
radiating portions to generate two different frequency bands, so
that the dual band antenna receives and sends wireless signals at
the first and second frequency bands.
Inventors: |
LEE; YI-CHIEH; (New Taipei,
TW) ; LIN; YEN-HUI; (New Taipei, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
CHIUN MAI COMMUNICATION SYSTEMS, INC. |
New Taipei |
|
TW |
|
|
Assignee: |
CHIUN MAI COMMUNICATION SYSTEMS,
INC.
New Taipei
TW
|
Family ID: |
50484869 |
Appl. No.: |
14/014574 |
Filed: |
August 30, 2013 |
Current U.S.
Class: |
343/700MS |
Current CPC
Class: |
H01Q 5/357 20150115 |
Class at
Publication: |
343/700MS |
International
Class: |
H01Q 5/00 20060101
H01Q005/00 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 19, 2012 |
TW |
101138831 |
Claims
1. A dual band antenna, comprising: a first radiating portion
comprising a first feeding arm that feeds first signals at a first
frequency band; a second radiating portion positioned spaced apart
from the first radiating portion, the second radiating portion
comprising a second feeding arm that feeds second signals at a
second frequency band; a resonating portion connected between the
first radiating portion and the second radiating portion, the
resonating portion resonating with the first and second radiating
portions to generate two different frequency bands, such that the
dual band antenna can receive and send wireless signals at the
first and second frequency bands.
2. The dual band antenna of claim 1, wherein the first radiating
portion is a monopole antenna, the second radiating portion is a
substantially planar inverted-F antenna (PIFA), the resonating
portion is a substantially planar micro-strip antenna.
3. The dual band antenna of claim 1, wherein the first radiating
portion, the second radiating portion, and the resonating portion
are in the same plane.
4. The dual band antenna of claim 1, wherein the first radiating
portion is a substantially inverted-L shape sheet, and further
comprises a first radiating arm perpendicularly extending from one
end of the first feeding arm; a distal end of the first feeding arm
is electronically connected to a printed circuit board to feed the
first signal.
5. The dual band antenna of claim 4, wherein the second radiation
further comprises a second radiating arm extending substantially
perpendicularly from the second feeding arm, the second radiating
arm is parallel to the first radiating arm, the second feeding arm
is parallel to the second feeding arm.
6. The dual band antenna of claim 5, wherein the second radiating
portion further comprises a grounding arm extending substantially
perpendicularly from the second radiating arm, the grounding arm is
grounded.
7. The dual band antenna of claim 5, wherein the resonating portion
comprises a connecting arm, a first extending arm, and a second
extending arm; one end of the connecting arm is perpendicularly
connected to the first feeding arm, the other end of the connecting
arm is connected to a junction between the second feeding arm and
the second radiating arm, and is perpendicular to the second
feeding arm; the first and second extending arms are spaced
extended from one side of the connecting arm opposite to the first
radiating arm.
8. The dual band antenna of claim 7, wherein the second extending
arm comprises a substantially L-shaped sheet and a substantially
U-shaped sheet connected to the L-shaped sheet, the L-shaped sheet
extends substantially perpendicularly from one side of the
connecting arm, and then perpendicularly extends toward the first
extending arm to be parallel to the connecting arm ; the U-shaped
sheet extends substantially perpendicularly from an end of the
L-shaped sheet to be parallel to the first extending arm, and is
then perpendicularly formed to be parallel to the connecting arm,
and finally perpendicularly extends along a direction away from the
connecting arm.
9. A wireless communication device, comprising: a dual band antenna
comprising: a first radiating portion comprising a first feeding
arm that feeds first signals at a first frequency band; a second
radiating portion positioned spaced apart from the first radiating
portion, the second radiating portion comprising a second feeding
arm that feeds second signals at a second frequency band; a
resonating portion connected between the first radiating portion
and the second radiating portion, the resonating portion resonating
with the first and second radiating portions to generate two
different frequency bands, such that the dual band antenna can
receive and send wireless signals at the first and second frequency
bands.
10. The dual band antenna of claim 9, wherein the first radiating
portion is a monopole antenna, the second radiating portion is a
substantially planar inverted-F antenna (PIFA), the resonating
portion is a substantially planar micro-strip antenna.
11. The dual band antenna of claim 9, wherein the first radiating
portion, the second radiating portion, and the resonating portion
are in the same plane.
12. The dual band antenna of claim 9, wherein the first radiating
portion is a substantially inverted-L shape sheet, and further
comprises a first radiating arm perpendicularly extending from one
end of the first feeding arm; a distal end of the first feeding arm
is electronically connected to a printed circuit board to feed the
first signal.
13. The dual band antenna of claim 12, wherein the second radiation
further comprises a second radiating arm extending substantially
perpendicularly from the second feeding arm, the second radiating
arm is parallel to the first radiating arm, the second feeding arm
is parallel to the second feeding arm.
14. The dual band antenna of claim 13, wherein the second radiating
portion further comprises a grounding arm extending substantially
perpendicularly from the second radiating arm, the grounding arm is
grounded.
15. The dual band antenna of claim 13, wherein the resonating
portion comprises a connecting arm, a first extending arm, and a
second extending arm; one end of the connecting arm is
perpendicularly connected to the first feeding arm, the other end
of the connecting arm is connected to a junction between the second
feeding arm and the second radiating arm, and is perpendicular to
the second feeding arm; the first and second extending arms are
spaced extended from one side of the connecting arm opposite to the
first radiating arm.
16. The dual band antenna of claim 15, wherein the second extending
arm comprises a substantially L-shaped sheet and a substantially
U-shaped sheet connected to the L-shaped sheet, the L-shaped sheet
extends substantially perpendicularly from one side of the
connecting arm, and then perpendicularly extends toward the first
extending arm to be parallel to the connecting arm ; the U-shaped
sheet extends substantially perpendicularly from an end of the
L-shaped sheet to be parallel to the first extending arm, and is
then perpendicularly formed to be parallel to the connecting arm,
and finally perpendicularly extends along a direction away from the
connecting arm.
Description
BACKGROUND
[0001] 1. Technical Field
[0002] The exemplary disclosure generally relates to antennas, and
particularly to a dual band antenna and a wireless communication
device employing the dual band antenna.
[0003] 2. Description of Related Art
[0004] Bluetooth (BT) antennas and global positioning system (GPS)
antennas are designed separately. In order to miniaturize portable
communication devices, when the BT antenna and the GPS antenna are
assembled into a wireless communication device (such as a mobile
phone), they are positioned adjacent to each other or assembled
together to occupy a common dielectric clearance region. However,
the frequency bands of the BT antenna and the GPS antenna often
interfere with each other. If the BT antenna and the GPS antenna
are positioned further apart from each other, an additional
dielectric clearance region will be needed, thereby increasing a
size of the wireless communication device.
[0005] Therefore, there is room for improvement within the art.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] Many aspects of the embodiments can be better understood
with reference to the drawings. The components in the drawings are
not necessarily drawn to scale, the emphasis instead being placed
upon clearly illustrating the principles of the disclosure.
[0007] FIG. 1 is a schematic view of a dual band antenna, according
to an exemplary embodiment.
[0008] FIG. 2 is a plan view of the dual band antenna of FIG.
1.
[0009] FIG. 3 is an RL (return loss) diagram of the dual band
antenna of FIG. 1.
[0010] FIG. 4 is a transmission efficiency measurement of the dual
band antenna of FIG. 1.
DETAILED DESCRIPTION
[0011] FIG. 1 is a schematic view of a dual band antenna 100,
according to an exemplary embodiment. The dual band antenna 100 is
used in a wireless communication device, such as a mobile phone or
a tablet computer, for example. The dual band antenna 100 includes
a first radiating portion 10, a second radiating portion 20, and a
resonating portion 30, all of which are positioned in the same
plane. The first radiating portion 10 is positioned spaced apart
from the second radiating portion 20, and the resonating portion 30
is connected between the first radiating portion 10 and the second
radiating portion 20.
[0012] In the exemplary embodiment, the first radiating portion 10
is a monopole antenna, the second radiating portion 20 is a planar
inverted-F antenna (PIFA), and the resonating portion 30 is a
planar micro-strip antenna.
[0013] The first radiating portion 10 is a substantially L-shaped
sheet, and includes a first radiating arm 11 and a first feeding
arm 13 perpendicularly extending from one end of the first
radiating arm 11. A distal end of the first feeding arm 13 is
electronically connected to a printed circuit board, so as to serve
as a feed point to feed first signals at a first frequency band,
such as 1575 MHz.
[0014] The second radiating portion 20 is a substantially F-shaped
sheet, and is positioned spaced apart from the first radiating
portion 10. The second radiating portion 20 includes a second
radiating arm 21, a second feeding arm 23, and a grounding arm 25.
The second feeding arm 23 and the grounding arm 25 extend
substantially perpendicularly from one side of the second radiating
arm 21, and are spaced from each other. The second feeding arm 23
is connected to one end of the second radiating arm 21, and the
grounding arm 25 is connected to a middle portion of the second
radiating arm 21. The second radiating arm 21 is parallel to the
first radiating arm 11, and the second feeding arm 23 is parallel
to the first feeding arm 13. A distal end of the second feeding arm
23 is electronically connected to the printed circuit board, so as
to serve as a second feed point to feed second signals at a second
frequency band, such as 2450 MHz. A distal end of the grounding arm
25 is grounded via the printed circuit board.
[0015] The resonating portion 30 includes a connecting arm 31, a
first extending arm 33, and a second extending arm 35. The
connecting arm 31 is a substantially longitudinal planar sheet. One
end of the connecting arm 31 is perpendicularly connected to the
first feeding arm 13, while another end of the connecting arm 31 is
perpendicularly connected to the second feeding arm 23. The first
and second extending arms 33 and 35 are spaced from each other and
extend from one side of the connecting arm 31 away from the first
radiating arm 11. The first radiating arm 33 is a substantially
longitudinal planar sheet, and is positioned between the second
extending arm 35 and the first feeding arm 13. The second extending
arm 35 is positioned between the first extending arm 33 and the
second feeding arm 23. The second extending arm 35 is
spiral-shaped. In particular, the second extending arm 35 includes
an L-shaped sheet 351 and a U-shaped sheet 352 connected to the
L-shaped sheet 351. The L-shaped sheet 351 extends substantially
perpendicularly from one side of the connecting arm 31, and then
extends perpendicularly toward the first extending arm 33 to be
parallel to the connecting arm 31. The U-shaped sheet 352 extends
substantially perpendicularly from an end of the L-shaped sheet 351
to be parallel to the first extending arm 33, and is then
perpendicularly formed to be parallel to the connecting arm 31, and
finally extends perpendicularly along a direction away from the
connecting arm 31.
[0016] FIG. 2 is a plan view of the dual band antenna 100 shown in
FIG. 1. In the exemplary embodiment, widths of the connecting arm
31, the first extending arm 33, and the second extending arm 35 are
about 0.5 mm. A length of the first extending arm 33 is about 6.5
mm. A distance between an edge of the first extending arm 33
opposite to the second extending arm 35 and an edge of the second
extending arm 35 opposite to the first extending arm 33 is about
4.2 mm. Widths of the first and second radiating arms 11 and 21 are
about 2 mm. A distance between the first and second radiating arms
11 and 21 is about 1 mm. A length of the first radiating arm 11 is
about 30.8 mm. A length of the first feeding arm 13 is about 6 mm.
A length of the second radiating arm 21 is about 17 mm. A length of
the second feeding arm 23 is about 3 mm. A length of the grounding
arm 25 is about 7 mm.
[0017] In use, the dual band antenna 100 is excited by the first
feed signals and the second feed signals respectively fed to the
first feeding arm 13 and the second feeding arm 23. The first
radiating portion 10, the connecting arm 31, and the second
radiating portion 20 cooperate to form a first current path,
thereby generating a first frequency band at about 1575 MHz. The
resonating portion 30 and the second radiating portion 20 cooperate
to form a second current path, thereby generating a second
frequency band at about 2450 MHz. The first frequency band is
generated by resonation between the resonating portion 30 and the
first radiating portion 10, and the second frequency band is
generated by radiation between the resonating portion 30 and the
second radiating portion 20. Therefore, the transmission
frequencies of the first and second radiating portions 10 and 20
are prevented from interfering with each other.
[0018] FIG. 3 is an RL diagram of the dual band antenna 100 shown
in FIG. 1. FIG. 4 is a transmission efficiency measurement of the
dual band antenna 100 shown in FIG. 1. A curve L1 in FIG. 3 is the
RL of the dual band measured at the first feed point of the first
feeding arm 13, and a curve L2 in FIG. 3 is the RL of the dual band
measured at the second feed point of the second feeding arm 23. As
shown in FIG. 3 and FIG. 4, the dual band antenna 100
receives/sends wireless signals at two frequency bands, and
achieves high transmission efficiency at each frequency band. In
particular, the RL of the dual band antenna 100 is less than -6 dB
when the dual band antenna 100 receives/sends wireless signals at
frequencies of about 1575 MHz and about 2450 MHz. Accordingly, the
dual band antenna 100 can be used in common wireless communication
systems, such as Bluetooth and GPS, with exceptional communication
quality.
[0019] It is believed that the exemplary embodiments and their
advantages will be understood from the foregoing description, and
it will be apparent that various changes may be made thereto
without departing from the spirit and scope of the disclosure or
sacrificing all of its material advantages, the examples
hereinbefore described merely being preferred or exemplary
embodiments of the disclosure.
* * * * *